linux-kernel - Re: Poor desktop responsiveness with background I/O-operations

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Message-ID: <4AB72FDC.5090403@datenparkplatz.de>
Date:	Mon, 21 Sep 2009 09:48:44 +0200
From:	Ulrich Lukas <stellplatz-nr.13a@...enparkplatz.de>
To:	unlisted-recipients:; (no To-header on input)
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Poor desktop responsiveness with background I/O-operations

Hi and thanks for your reply!


Mike Galbraith wrote:
> nicing a shell or the dd should (and does) help a LOT.

If this is the only way to influence this, maybe the default settings
for the niceness of interactive and non-interactive tasks are not the
best choice. (Maybe a distribution problem in this case)



> reads are sync, more heavily affected by seek latency than writes.

But how does this explain the seconds-long delays?

If an interactive process causes a lot of seeks because of reads/writes
which "are sync", I see how this can greatly slow down otherwise
pipelined write operations, but the other way around?
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